【Pthon入门学习】99乘法表

学习知识点：

1. string.join(seq): 以string字符串作为分隔符，将seq的所有元素拼接成一个新的字符串

s = ['%d * %d = %d' % (y, 4, 4*y) for y in range(1, 5)]
print('	'.join(s))

2. list的赋值可以采用表达式

s = ['%d * %d = %d' % (y, 4, 4*y) for y in range(1, 5)]

下面是99乘法表的拆分过程

1. 打印第i行

i = 5
s = ['%d * %d = %d' % (y, i, y * i) for y in range(1, i+1)]
print('	'.join(s))

2. 打印多行

i = 1
s = ['%d * %d = %d' % (y, i, y * i) for y in range(1, i+1)]
print('	'.join(s))
i = 2
s = ['%d * %d = %d' % (y, i, y * i) for y in range(1, i+1)]
print('	'.join(s))
i = 3
s = ['%d * %d = %d' % (y, i, y * i) for y in range(1, i+1)]
print('	'.join(s))

3. 再次借助join的方式实现

i = 1
s = ['%d * %d = %d' % (y, i, y * i) for y in range(1, i+1)]
# print('	'.join(s))
i = 2
s = ['%d * %d = %d' % (y, i, y * i) for y in range(1, i+1)]
# print('	'.join(s))
i = 3
s = ['%d * %d = %d' % (y, i, y * i) for y in range(1, i+1)]
# print('	'.join(s))

print('
'.join('	'.join(s) for i in range(1, 10)))
#将s替换成表达式后即为99乘法表
print('
'.join('	'.join(['%d * %d = %d' % (y, i, y * i) for y in range(1, i+1)]) for i in range(1, 10)))